128915581241 has 2 divisors, whose sum is σ = 128915581242. Its totient is φ = 128915581240.

The previous prime is 128915581133. The next prime is 128915581243. The reversal of 128915581241 is 142185519821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125206284025 + 3709297216 = 353845^2 + 60904^2 .

It is a cyclic number.

It is not a de Polignac number, because 128915581241 - 2¹⁸ = 128915319097 is a prime.

It is a super-2 number, since 2×128915581241² (a number of 23 digits) contains 22 as substring.

Together with 128915581243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128915581243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64457790620 + 64457790621.

It is an arithmetic number, because the mean of its divisors is an integer number (64457790621).

Almost surely, 2^128915581241 is an apocalyptic number.

It is an amenable number.

128915581241 is a deficient number, since it is larger than the sum of its proper divisors (1).

128915581241 is an equidigital number, since it uses as much as digits as its factorization.

128915581241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 47.

The spelling of 128915581241 in words is "one hundred twenty-eight billion, nine hundred fifteen million, five hundred eighty-one thousand, two hundred forty-one".